GIGABIT ETHERNET DESIGN ECE164.02 - Spring 2004 Group 1 Presentation 8 – Yashar Pirzadeh

Progress Summary Got transmitter eye (long story) on non-aggressive board Soldered aggressive transmitter and receiver Website up Continued work on paper

Gantt Chart

Non-Aggressive Transmitter Troubleshooting Replaced VCSEL (leads broke) Checked every solder lead and VCSEL orientation Tried different grounds Used probe to troubleshoot: Why differential signals off? Possible short

Non-Aggressive Transmitter Troubleshooting (cont.) One signal was really strong, the other signal was really weak Strong signal was at small DC value, but had large peak-to-peak value Conclusion: VCSEL must not be biased

Solution On further inspection, potentiometers wrongly swapped!

Success For the first time in optical testing: no Rx loss signal

Transmitter Testing

Next Week’s Agenda (and beyond) Get Everything Done Clean non-aggressive build and test Fix aggressive power short Test aggressive transmitter/receiver XYZ Plane Analysis BER Tests Better Documentation and More Photos Finish Report Final Web Site Update

THE END Group Members Russell Cook Yashar Pirzadeh James Dezelle